/Engine/Plugins/Runtime/Metasound/Source/MetasoundGraphCore/Public/MetasoundVertex.h
Return the sort order index of a vertex with the given name.
The index of the vertex. INDEX_NONE if the vertex does not exist.
int32 GetSortOrderIndex ( const [FVertexName](API\Plugins\MetasoundGraphCore\FVertexName) & InKey ) const